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Posted on 2006-10-24
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Last Modified: 2008-02-26
Hi,
As there is no validation for a check box I slid in a Javascript function to check that a checkbox has been checked and to alert the user and stop the form from submitting if they haven't.
Done this many many times in classic ASP but .NET doesn't seem to want to play.
Have a made a syntax error? Is it something to do with all the forms being server-side?

The function:
<script language="javascript" type="text/javascript">
   function AgreeCheck() {
        if(document.form1.ChkAgree.checked = false)
        {
            alert('Please tick the I agree box to continue');
            document.form1.ChkAgree.focus();
            return false;
        }
     }
   </script>

The event:
<form id="form1" runat="server" onsubmit="return AgreeCheck()">

The html server up:
<form name="form1" method="post" action="Default.aspx" onsubmit="javascript:return WebForm_OnSubmit();" id="form1">

Error:
document.form1.ChkAgree is null or not an object
0
Comment
Question by:QPR
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8 Comments
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 17799005
can you tell us how you defined the ChkAgree input?
I guess that the issue is case sensitivity...
0
 
LVL 17

Expert Comment

by:Daniel Reynolds
ID: 17799337
Is the ChkAgree control within the Form tags?
0
 
LVL 29

Author Comment

by:QPR
ID: 17799434
<asp:CheckBox ID="ChkAgree" runat="server" />
Yes inside form tags
0
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LVL 17

Expert Comment

by:Daniel Reynolds
ID: 17799570
Create a hidden field html field to carry the value of the checkbox. Set it when the checkbox is clicked.
Check the value of that field instead of the server control.
0
 
LVL 10

Expert Comment

by:jnhorst
ID: 17799795
First fix your operator in the if statement to "==".  Then make sure your form tag is named "form1".  Based on your comment above it looks like your <input type="checkbox"...>, when rendered, may not have a name attribute.  It should render like this (do a View Source to see):

<input type="checkbox" id="ChkAfree" name="ChkAgree".../>

The name part of the name/value pair in an HTML form comes from the name attribute in the input tag.

John
0
 
LVL 29

Author Comment

by:QPR
ID: 17800550
changed operator to ==
added name="form1" (visual studio put a squiggle under that but no problem)

Same error null or not an object.
It would be null if unchecked would it? Can you give a checkbox an unchecked value?
0
 
LVL 29

Author Comment

by:QPR
ID: 17800557
solved it myself.
I changed the checkbox from an asp server side control to a bog standard html input type.
Now all is fine!
0
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 0 total points
ID: 17801124
PAQing question with points refunded
angelIII, page editor
0

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